Chalk-hanger



inoan IMM- n in'caomi to a, lam-Q11,

ally l lo/m it/may. gong n 1 it. lznown that of the finite .mporogyomon opr lugs omm 1s o spooilmatgon...

on relates .120 electric [spa lcf no in oo-mlmstion engines; espo so of the) hypo mood on motoi's for s omliillxor land or nlmri e vehi- Ci; of 111 ,11 invention is 'lio proo Ll'CP' lLl l'l -LOf lzhoeleotrmlos by Carbon. inhooapt to min reason l the l1}.7(l1.0-f 2ll'h011 fuel, rfootnombu lion. of'tlio limiter and. 1" masons ell known in. the art. Nontion consiots oogontinlly in m I the l in tho ,form..o..

protection 01. H ireolimpingement; on

at the some,

lino imp '2 ooi homo. lll'lfl Bllfikl'g-BS oi? hydzrm oreoting on incipient, 9; .llJlOll olmmlrzoa: 'botweo" the two eleotigpleng. "he cl'mrge fin inn; ex llosion in which tends to blow oil l lnzop clean the o gtiposorjl surlfaoes of oofah bmfls,--at tho some: t: o subjocii'nsg the or caooloirlzroalo lmnporzu'lly to of hoot high onongli to m'ocluoo 1ncanoe for o period suliioiont to inouro iu'milm; and icoiluotion of carbon. wiicluo rosnltinn" from impel-foot, ooniibnsll I f ,lno'i'llor more fully set forth.

. 14 ino; drawings,

n, l on olomiiion of spoil; plug .oil with one foi'm. of my map Bloc-- 525, is an inner end. elevation thor'eof;

.1. Fig. 3. is a ,ion of the inner ono the sgmrlz: plug upon an enlarged scale for olem of illustration, line 3 3, Fig. 2;

Fig. 4: a, transverse section. taken upon lano o'l lino l ll, lT' 3;

and taken upon lano Fig. '5, is an olovam n of the cap electrode "n. in lilio preceding figures; and.

is a View lilio unto Fig. 3, showing ill-1,: n of the electrode.

olorlngg than: cleaning or iroplacomenb imililitfiln 1 .x, NEW JERSEY.

JPQTENT OFFICE.

w i u;

min. Serial N 224,002.,

pomlivo al'tir comparatively sllorlg pol'iods v of we. In other Words, tho-life and utility of a, spark plu used to effect the explosion bot engtho sparking poles.

oliviagto thisdifiiculty by making one of the. eleotrorlos; prefombly the ground or negative oloolrocle n, in he fornghof' a cap adapfcogl to fit over, inoloso, alldlfilflield the .o tl1e11, o .Bontml .pooitivo. or high tension fro'alo sn'b iiantiolly as shown. in tho -*ings said. oon-eleotrodo f 1 being formed. with openings n 0 an "aggregate area min-1 hon. vapor into the inolooerl spacos, to pro vide for an incipient explosiontl'ierein when .tho spark passes between the elootrodosp n,

'wll'ilo a l, llio son v v soul on04*Retrofit,- m Sufi 16161115. In extent l0 sli' surface '61:

lilo control pogiti v" golectljodfi p5" ot inqmot'. oi tholiyd yoonrbon n a 1216 can electrode n, s nmcl'o of relatively thin nickle alloy or equivalent metallic sub-- 1 '54 once that will not fuse or burn even when incmnlesceeiit, as Whom romlorod temporarily so by tho 11ml; gone? i l both. by the incipl on charge 1;; i 'nition within the is, and by tho COHlbllS- 1o moi-'1' (alum-go ol llydroombon in 'l'ho no .21 of the mololl ll; is ()lJVlOUS that the openings n", in the oapolooiroilo n, 2113. be oi various forms withmil clopa. W f F0111 igho spirit of my in voolion, and. n like results so that l (lo Jail-t y J. in. thin respect Thus, in

1 lt'ooz' guxos oi the acoommnying drawings I Sl'LOW the openings n, as made in.

the form of l'z'uillzflll slots, While in Fig. 6,.

round or oblong openings are adapted to perform a like function in proyiding for restricted. communication with tho incipient ignition ClMLIHlOBF or space s.

Also, it is obvious that thelcop-eleotrodo n, being preferably made in the form of on atmurhnient may be allixocl to the spark plug in contactual and. electrical engagement with the ground, or shell g, in various Ways with like result. Thus, in Fig. 3, the intumecl edges of the cop-electrode n, are shown as preeasod into a groove formed bejcwyeen the shell midi the insulatlng sleeve 2 m which 025% one of the slots n, may be extended to ENE UNITED srnrns PATENT creme;

HARRY. It. HIRST, OF TRENION, NEW JERSEY, ASSIGNOE OF ONE-HALF, T FREDERICK S DEABDEN, OF TRENTON, NEW JERSEY.

OHALKJ-IANGER.

T 0 aZZ whom it may concern:

c it known that I, HARRY R. Hirer, a citizen of the United States, residin at Trenton, in the countyof Mercer-and State of New Jersey, have invented certain new and useful Improvements in Chalk-Hangers, of which the following is a specification.

My invention relates to improvements in a chalk hanger for pool and billiard tables. The object of invention is to provide a-chalk hanger which will carry a block of chalk on a flexible extension cord, in an elevated position and which will allow the cord to be extended and the chalk conveniently used for chalking a cue; a further object of my invention is to arrange the weight, provided for returning the chalk to its normal position, so that it will slide upon the cord and thus return slowly to the normal position without making any jar or sound and without causing the chalk to fly back and strike the ceiling or the walls of the room; heretofore freely acting springs and weights have been used to pull the chalk back to its original position after the user lets go of it and the chalk would fly back with a crash against the ceiling, causing the plaster to fall upon the tables and also break the piece of chalk; a still further object of my inven- 30 tion is to provide a properly balanced weight which will tend to straighten the cord should it become twisted; a still further object of my invention is to provide a suitable chalk clamp for attaching the block of chalk to the cord and for holding the chalk so that it can not be removed from the clamp without breaking it into pieces; and a still further object of my invention is to provide a suitable pulley for holding the cord to be the ceiling and permit the cord to be in clined at any angle and also keep the cord from becoming entangled.

Referring to the accompanying drawing; Figure 1, is a side elevation of my improved chalk hanger; Fig. 2 is an edge view of the pulley shown in Fig. 1; Fig. 3, is a plan view of the weight; Fig. 4:, is a vertical section of the clamp shown in Fig. 1; and Fig. 5, is a horizontal section on line 5-5 Fig. 4.

In the drawings in which like reference characters refer to like parts, 1 represents a pulley having a swiveled plate 2, loosely pivoted in the side members 3. Said plate 2 is provided with an aperture through Specification of Letters Patent. Patented N 30, 1920. AppIication filed May 28,

1919. Serial No. 300,313.

which a screw 5, or other suitable fastening device, may pass to secure the pulley to the ceiling of a room. A cord 6 passes over the Wheel 4 of the pulley and through holes formed in the guide plate 7, provided to in sure the cord running freely over the pulley.

Attached to one end of the cord 6 is a weight 10, which is oval shape in plan view, as shown in Fig. 3. The weight is provided with an aperture 12, extending through the heavier portion of the weight, to receive the end of the cord 6. The cord has an enlarged end 9 thereon, which fits into a countersunk recess formed in the Weight, and sup ports the latter.

The weight is provided at its smaller end with an aperture 1 forming a free passageway through the weight for the portion 8 of the cord to pass. A knot 15, located in the cord below the weight limits the clownward movement of the weight.

The center of gravity of the weight is adjacent to the end 9 of the cord, so that-when the weight is resting upon the knot it will be slightly tilted, as shown in full lines in Fig. 1, this reduces the tendency of the weight to spin and causes it to come to rest when the upper portions of the cord are not twisted around each other. then the weight 10 is raised by pulling down on the free end of the cord the weight will hang level, as shown in dotted lines Fig. 1, and the portion 8 ofthe cord will run freely through the passageway 14: formed in the weight.

The chalk clamp 18 consists of a rectangular metal shell, open at the bottom for the insertion of a block of chalk 19. The side walls 20 of the clamp are provided with inwardly bent tongues 21, formed from the metal shell by cutting through the wall 20, on three sides of the tongue. The resilient nature of the metal of the tongues causes them to act as springs and impinge against. the block of chalk. when the latter is pressed into the shell. The sharp edges 22 of the tongues 21 prevent the block of chalk from being pulled out of the clamp without breaking the chalk, and thus prevents the chalk from being stolen.

The dome shaped top 24 of the clamp provides room for the knot 25, formed on the cord after it has been passed through the aperture 26 formed in the dome of the clamp. The clamp as thus constructed per- 

